THE NERVOUS SYSTEM. 



331 



TABLE OF THE SPINAL NERVES. (Continued.) 



Brachial 

 plexus, 



below the 

 clavicle, 

 cont'd, 



Miisculo- 

 spiral, 



Posterior 

 divisions, 



Muscular 

 branches, 



Radial, 



Cutaneous. 



Posterior 

 interosseous, 



External 

 branches, 



Internal 

 branches, 



Supinator longus, extensor 

 carpi radialis longior, tri- 

 ceps, anconeus, brachialis 

 anticus. 



Supplies adjoining sides of 

 thumb arid index finger, 

 index and middle, middle 

 and ring fingers. 



Inner side of arm, elbow, 

 radial side of forearm, and 

 wrist. 



Posterior brachial and radial 

 muscles, except those sup- 

 plied by ulnar (muscular 

 branches). 



Muscles and skin of the back. 



Lumbar 

 nerves, 



Posterior 

 divisions, 



Anterior 

 divisions, 



Lower six 



(thoracico- 



abdominal 



intercostals), 



External 

 branches, 



Internal 

 branches, 



The last dorsal gives off the 

 dorsi lumbar to the quad- 

 ratus lumborum muscle. 



Muscles of the skin of the 

 back. 



The four upper unite to form the lumbar 

 plexus. The fifth., with a branch from the 

 fourth, joins the sacral nerves to form the 

 lumbo-sacral cord. 



To the walls of chest and abdomen. 



